I haven't been benching as part of this particular program, but when I did Stronglifts 5x5, I stalled out at 65 lbs.

I maxed at my highest in August of 105 and then struggled hard mainly due to shoulder impingement injury. One thing that's always helped me add weight to my lifts is reverse pyramiding. Do your 1-2 warmup sets at 50% and only around 5-6 reps, don't burnout first. Then for your very first set of 4-5 reps due your max weight plus 5-10lbs and you'll be surprised. Follow with your sets after of 6r, 8r with lower weights each time then next week you should be able to add even more. I've found it more successful for me this way than traditional 5x5. Bench isn't easy for many women, it's just not a strong area in terms of muscular development we use or build as frequently as men.

The thing is, I don't have trouble with the ohp, went from 25x4x5 to 30x4x5 in 3 weeks (4th workout to come on Thursday).

That's great! OHP is my weakest lift by far.

my bench gains are slow but they are there. Having a spotter has been HUGE for me, having the confidence and ability to push myself through those last few reps is whats doing it. Before i had a spotter i was stuck around 75-85 because i was scared to go heavier and getting stuck under the weight and scared of the last two reps, i'd stop before i was ripping fibers. I really recommend getting a good spotter, and talking to them about how to spot you. You dont want them to just yank the bar away when you get stuck , they have to assist just enough to get through those last couple reps. Your spotter will also help you maintain your form so you can get the most out of your lift. Really talk to your spotter and work together.
I do 6x5 sets flat bench and 6x5 incline and 6x5 flys twice a week. I'm toast by the time i'm done. i take 2 - 3 days off for recovery.
I also spend time working on negatives, lowering the bar down super super slowly . I will pack on more than i can lift and then do negatives and my spotter helps me lift the bar, and then i can lower back down slowly. Negatives are really good for building muscle. I went from 75-85 to 105-115 in 6 weeks.
the same with OHP, i only do them with a spotter and i have slow but steady gains.

if you dont have a spotter, you can do single arm presses with dumbbells and spot yourself with your other arm, and you can always throw down the weight if you lose it. thats another way to get a good rip in the fibers . Also pushups do lots of pushups to fatigue. and if you can do pushups easily, start doing single arm pushups. Do them on inclines, with your feet raised, there are all kinds of ways to get good chest rip that help on the bench.

If you're doing chest and tris together how does your order look? I actually never recommend people to work these together bc one burns out the other quickly and you can't reach your full potential. I know many do and it's all about preference but I've seen others, including myself, have better success doing push/pulls together.

Also if you don't have a spotter why not bench in the power rack? I know the bros will moan and grunt, but f**k 'em.

so do you do tris on leg day? i dont know when else i could squeeze them in, since they do get burned up on the bench and with pull ups anyways, my leg day is generally an arm/chest rest day. Do you do them later in the day on chest day? I dont even really work my bis and tris that hard by themselves since they get worked with the big lifts.

so do you do tris on leg day? i dont know when else i could squeeze them in, since they do get burned up on the bench and with pull ups anyways, my leg day is generally an arm/chest rest day. Do you do them later in the day on chest day? I dont even really work my bis and tris that hard by themselves since they get worked with the big lifts.

Push/Pull

Back/Tris, Chest/Bis or together on a day by themselves. I like to keep them on a day alone with cardio and the last thing I do in the week. And yes, with any isolation move, if it's a combined workout it's kept at the end.